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Date: Thu, 02 Feb 2017 13:48:32 +0100
From: DK7FC <selberdenken@posteo.de>
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In-Reply-To: <58920FFF.9050405@posteo.de>
Subject: Re: ULF: Transmission announcement for 2970 Hz
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Status: O

Hi Paul,

But the data of the transmissions that happened so far are saved on 
another PC, right? Would be a pity if they are lost.

I risked to transmit during the rain last night. the coil is protected 
against rain with a simple trash bag. The antenna current dropped to a 
level very close to the limit, but obvioulsy not below. Today a visual 
inspection showed that a few drops seem to be completely uncritical. No 
HV erosion visible. I know how that looks from LF! 20 kV on 2.97 kHz is 
a different thing than 20 kV on 137 kHz!!

Now i set to current to 160 mA, an increase of 0.56 dB...

No trace at all on Renatos 5 uHz spectrogram 
http://www.webalice.it/rromero/live_cumiana/last-LFtest_2970.jpg Each 
update will be exciting :-)

73, Stefan


Am 02.02.2017 12:21, schrieb Paul Nicholson:
>
> A good signal here Uwe.
>
> > Meanwhile i'm transmitting since 35 hours a stable
> > carrier on 2970.000000 Hz :-)
>
> I have just managed to install another 2TB scratch disc
> in my workstation - at last.  Have been waiting some time
> for the chance to shut it down.
>
> Now I can really get to work on those elusive 2970 Hz signals!
>
> -- 
> Paul Nicholson
> -- 


Am 01.02.2017 17:42, schrieb DK7FC:
> ...transmission still running. The ex forecast shows a slight rain in 
> an hour. I disabled the ALC and set the safety limit to 10 mA. If the 
> coil becomes wet, the resonance will drop, the antenna current will 
> drop. After 3 seconds below 140 mA the carrier will stop. But maybe i 
> am lucky and the rain will not set in here...
>
> 73, Stefan
>
> Am 01.02.2017 00:29, schrieb DK7FC:
>> Hi ULF,
>>
>> Since 23:25 UTC i'm running 150 mA antenna current again on 
>> 2970.000000 Hz.
>>
>> If the wx permits, i'll run it for 24 hours or so...
>>
>> 73, Stefan
>>
>> Am 30.01.2017 15:08, schrieb DK7FC:
>>> Hi Paul, ULF,
>>>
>>> Am 29.01.2017 18:26, schrieb Paul Nicholson:
>>>>
>>>> Stefan wrote:
>>>>
>>>> > From the known decoded EbNaut messages, what was the SNR at
>>>> > Renato or on your side?
>>>>
>>>> Nothing detectable here or at Cumiana so I can't answer the
>>>> question of how many days need stacking.  Until there is some
>>>> glimpse of a signal, it is completely unknown.  I can only
>>>> estimate a lower limit.
>>> Yes, we don't even know if the night could be better than the day.
>>>
>>>> Between 2016-06-26 13:00 and 2016-07-31 08:00 you transmitted
>>>> carrier with 30mA antenna current.  I received and stacked
>>>> over 34 days of carrier (about 15dB stacking gain) with no
>>>> sign of signal.  You estimated 100nW ERP.
>>>>
>>>> Now you can do 150mA current - about 14dB gain over July's
>>>> signal.  Plus, improvements here to filtering and blanking
>>>> may add 2 or 3dB more.
>>> Plus the lower QRN!
>>>
>>>> We can in two days exceed the stacked signal for the whole
>>>> of July.  Also with your higher ERP I can see the signal each
>>>> day at Bielefeld to check the phase.
>>> Yes, Wolf's RX is a nice feedback channel for the daily tests.
>>>> I think we should try some daytime carrier repeats.  Already we
>>>> know there is nothing after 2 days so we will need at least
>>>> 4 days to get a hint of signal and then at least 10 days to
>>>> collect enough signal for some measurements.  It is surely
>>>> certain that we will eventually pick up the signal after
>>>> enough days.
>>> Yes, more adding is the only way to find out what happens between 
>>> QRB of  3 and 5 lambda, and 8.8 lambda!
>>>
>>> I assume you have saved the data from Cumiana to add the signals 
>>> that i transmitted so far at 150 mA?
>>> That was:
>>> Jan, 20th, 8...20:00 UTC 2970.000 Hz
>>> Jan, 21th, 8...17:00 UTC 2970.000 Hz + 17...20 UTC 269.9975 Hz
>>> Jan, 22th, 8...14:45:20 UTC 2970.000 Hz, reconstructed carrier of 
>>> EbNaut (8K19A, CRC16, 7ch, 40s, message: 'F/DK7FC')
>>> Jan, 24th, 8... 16:00 UTC 2970.000 Hz, reconstructed carrier of 
>>> EbNaut (16K25A, CRC18, 3ch, 30s, message 'ULF')
>>> Jan, 25th, 7... 16:20 UTC, 2970.000 Hz, reconstructed carrier of 
>>> EbNaut (16K25A, CRC16, 5ch, 30s, message 'DK7FC')
>>>
>>> That's already 42 hours in daylight (8...17 UTC), a peak shown in 
>>> 6.6 uHz. And there is nothing at all?
>>> Can we assume that Renato's RX has the full sensitivity on 2970 Hz? 
>>> The sferics always appear very strong. I clearly expected to see 
>>> Markus on 8270 Hz in JN38OO, even with my resonated antenna, because 
>>> the sferics still looked so strong. But there was not a trace at 
>>> all! It is hard to imagine that Wolf can decode the messages 
>>> 'easily' and Renato can't seea faint peak. But maybe, that's how it 
>>> is. I should do a holiday weekend again, in 4 lambda distance...
>>>
>>> If the wx permits, i will run a carrier tomorrow on 2970.000 Hz 
>>> between 8...17 UTC.
>>>
>>> 73, Stefan
>>>
>>>
>>
>